Thanks for the responses so far.
Perhaps a little clarification of the question is appropriate at this time. I am not expecting I will necessarily like what someone else likes or that my amp / speaker / guitar combinations will sound exactly the same. What I am looking for is other peoples experience with various tubes but especially some of the more esoteric and expensive versions or any less expensive plumbs out there.
It might be helpful to understand what speakers / guitars etc are used but I suspect useful insight can come without that information.
I see no reason to shy away from technical discussion on a technical forum.